Harrisburg's post office was established
February 9, 1887 and discontinued September 29, 1906. Like most
towns, harrisburg lived and died with the mines. Discovered in
1886 by Captain Charles Harrisburg and founded by Charles and
Governor Trittle of Arizona, Harrisburg was thought to be on
the road to being one of the biggest towns in Arizona. That dream
was never realized, though, as the mines played out and the town
died. The cemetery was rediscovered in 1936 after being forgotten
and the Arizona State Highway Department erected a monument.

Harrisburg, Arizona: "Desert Trail to Contentment", is a June 1941 article in Desert Magazine by Lois Elder Steiner on the last resident of Harrisburg, even after all the buildings had been torn down or moved elsewhere. Page 17Two photos: http://www.dezertmagazine.com/mine/1941DM06/index.html